Fix minor problems found by static checking.
* coding.c (encode_inhibit_flag, inhibit_flag): New functions. Redo the latter's body to sidestep GCC parenthesization warnings. (setup_coding_system, detect_coding, detect_coding_system): Use them. * coding.c (detect_coding, detect_coding_system): * coding.h (struct undecided_spec): Use bool for boolean. * image.c (QCmax_width, QCmax_height): Now static. * xdisp.c (Fmove_point_visually): Remove unused local.
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